Hi, shulam
Ah, the woes with signal handling :)
use 5.20.2;
use warnings;
use threads;
use Time::HiRes qw/ time usleep /;
$SIG{USR2} = 'IGNORE';
$SIG{TERM} = 'IGNORE';
my $pid;
if (($pid = fork()) == 0) {
sleep 1;
my $ppid = getppid();
for (1 .. 1000) {
usleep(int(rand(100000)));
kill 'USR2', $ppid;
kill 'TERM', $ppid;
}
}
my $main_thr = threads->self();
$SIG{TERM} = sub { say "TERM"; };
$SIG{USR2} = sub { say "USR2"; };
my $thread = threads->create(sub {
# Depending on implementation, the thread may receive the signal.
# One way is to relay the signal to the intended recepient.
$SIG{TERM} = $SIG{USR2} = sub {
$main_thr->kill($_[0]);
};
# Sleep stops early upon receiving a signal.
my $start = time;
do {
usleep 1000;
} until (time - $start >= 10.0);
threads->exit();
});
# Wait for thread to finish.
while ($thread->is_running()) {
usleep 1000;
}
# Reap thread.
$thread->join();
# Ditto, reap child.
kill('KILL', $pid);
waitpid($pid, 0);
Regards, Mario
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